Tapestry 3.x and 4.x - Java-Springs

From the Tapestry homepage:
Tapestry is an open-source framework for creating dynamic, robust, highly scalable web applications in Java. Tapestry complements and builds upon the standard Java Servlet API, and so it works in any servlet container or application server.

While Spring has its own powerful web layer, there are a number of unique advantages to building an enterprise Java application using a combination of Tapestry for the web user interface and the Spring container for the lower layers.

A typical layered enterprise Java application built with Tapestry and Spring will consist of a top user interface (UI) layer built with Tapestry, and a number of lower layers, all wired together by one or more Spring containers. Tapestry's own reference documentation contains the following snippet of best practice advice.

A very succesful design pattern in Tapestry is to keep pages and components very simple, and delegate as much logic as possible out to HiveMind [or Spring, or whatever] services. Listener methods shouldideally do little more than marshal together the correct information and pass it over to a service.

The key question then is: how does one supply Tapestry pages with collaborating services? The answer, ideally, is that one would want to dependency inject those services directly into one's Tapestry pages. In Tapestry, one can effect this dependency injection by a variety of means. This is only going to enumerate the dependency injection means afforded by Spring. The real beauty of the rest of this Spring-Tapestry integration is that the elegant and flexible design of Tapestry itself makes doing this dependency injection of Spring-managed beans a cinch. (Another nice thing is that this Spring-Tapestry integration code was written - and continues to be maintained - by the Tapestry creator Howard M. Lewis Ship, so hats off to him for what is really some silky smooth integration).

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